Discussion
A permanent magnet stepper motor differs from a variable reluctance one in having
Answer: D
Correct answer: detent torque when de-energised
The rotor magnet interacts with the stator iron even with no current flowing, so the shaft resists displacement and holds its last position without power. This is often a useful safety property; where a free shaft is wanted when de-energised, the variable reluctance type is chosen instead.
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